Download Computational Gas-Solids Flows and Reacting Systems: Theory, by Sreekanth Pannala PDF
By Sreekanth Pannala
Gas-solids reactors, which frequently represent serious steps of power and chemical conversion approaches, are in determined want of recent layout easy methods to raise their potency and reliability, as they're poorly understood and hard to enhance upon.
Computational Gas-Solids Flows and Reacting structures: concept, tools and Practice addresses the necessity for a finished booklet on computational gas-solids movement to assist researchers, graduate scholars, and training engineers during this swiftly increasing zone. This distinctive ebook presents a whole exploration of the speculation, numerical equipment, and practices linked to this rising quarter, together with hydrodynamic equations, quadrature-based second tools, and direct numerical simulation.
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Extra resources for Computational Gas-Solids Flows and Reacting Systems: Theory, Methods and Practice
For example, jets of volatiles (gases) will issue when coal particles are heated. There is no way to determine the direction of those jets within the context of the continuum equations presented in this chapter, however. Because the equations do not contain a field variable that tracks the direction of the jets, we cannot but assume that the jets issue uniformly in all directions. In that case the jets cause a net-zero force on the particles—two jets in diametrically opposite directions cancelling out the force exerted by each on the particle.
1993), the function ϕ(εg) is a Heaviside step function. The viscous stresses are represented by σviscous, while the quasi-static and plastic stresses are represented by σplastic. Plastic Regime Syamlal et al. (1993) developed constitutive equations for the plastic regime using Schaeffer’s frictional theory (Schaeffer, 1987). This model is usually called the Schaeffer model in the literature. Benyahia (2008a) has compared this model with the model of Srivastava and Sundaresan (2003). 32) 27 Multiphase Continuum Formulation for Gas-Solids Reacting Flows With this model, we need to specify the critical void fraction below which only plastic stresses are included.
The irreversible rate of increase of internal energy due to viscous dissipation and interphase momentum transfer has been neglected. Such terms are negligible except in the case of very large relative velocities.